#!/bin/sh

WORK="$PWD/nvm_wget_is_gnu-work.$$"
TEST_BIN="$WORK/bin"
NO_WGET_BIN="$WORK/no-wget-bin"

cleanup() {
  unset -f die cleanup check
  unset WGET_VERSION_OUT WGET_VERSION_ERR WGET_VERSION_EXIT
  rm -rf "$WORK"
  export PATH="$OLDPATH"
}
die () { echo "$@" ; cleanup ; exit 1; }

\. ../../../nvm.sh

\. ../../common.sh

OLDPATH="$PATH"

mkdir -p "$TEST_BIN" "$NO_WGET_BIN"

# `command wget` bypasses shell functions, so the fake must be an executable:
# for `--version` it prints $WGET_VERSION_OUT to stdout, $WGET_VERSION_ERR to
# stderr, and exits with $WGET_VERSION_EXIT; it fails on anything else
{
  echo '#!/bin/sh'
  echo '[ "$#" -eq 1 ] && [ "$1" = --version ] || exit 99'
  echo '[ -z "${WGET_VERSION_OUT-}" ] || printf "%s\n" "${WGET_VERSION_OUT}"'
  echo '[ -z "${WGET_VERSION_ERR-}" ] || printf "%s\n" "${WGET_VERSION_ERR}" >&2'
  echo 'exit "${WGET_VERSION_EXIT:-0}"'
} > "$TEST_BIN/wget"
chmod +x "$TEST_BIN/wget"

export WGET_VERSION_OUT WGET_VERSION_ERR WGET_VERSION_EXIT
export PATH="$TEST_BIN:$OLDPATH"

# args: expected exit code, description
check() {
  try nvm_wget_is_gnu
  [ "${CAPTURED_EXIT_CODE}" = "${1}" ] || die "nvm_wget_is_gnu with ${2}: expected exit code ${1}, got ${CAPTURED_EXIT_CODE}"
  [ -z "${CAPTURED_STDOUT}" ] || die "nvm_wget_is_gnu with ${2}: expected no output, got >${CAPTURED_STDOUT}<"
  try_err nvm_wget_is_gnu
  [ -z "${CAPTURED_STDERR}" ] || die "nvm_wget_is_gnu with ${2}: expected no error output, got >${CAPTURED_STDERR}<"
}

# GNU Wget
WGET_VERSION_OUT='GNU Wget 1.21.2 built on linux-gnu.

-cares +digest -gpgme +https +ipv6 +iri +large-file -metalink +nls
+ntlm +opie +psl +ssl/openssl'
WGET_VERSION_ERR=''
WGET_VERSION_EXIT=0
check 0 'GNU Wget 1.21.2'

WGET_VERSION_OUT='GNU Wget 1.14 built on linux-gnu.'
check 0 'GNU Wget 1.14'

# GNU Wget2 is a different program, and says so
WGET_VERSION_OUT='GNU Wget2 2.1.0 - multithreaded metalink/file/website downloader'
check 1 'GNU Wget2'

# BusyBox wget rejects `--version`, on stderr, which is not shown
WGET_VERSION_OUT=''
WGET_VERSION_ERR="wget: unrecognized option '--version'
BusyBox v1.36.1 (2023-06-02 00:42:02 UTC) multi-call binary."
WGET_VERSION_EXIT=1
check 1 'BusyBox wget'

# "GNU Wget" on stderr does not count
WGET_VERSION_ERR='GNU Wget 1.21.2 built on linux-gnu.'
WGET_VERSION_EXIT=0
check 1 '"GNU Wget" only on stderr'

# "GNU Wget" must start a line
WGET_VERSION_ERR=''
WGET_VERSION_OUT='not GNU Wget 1.21.2'
check 1 '"GNU Wget" not at the start of a line'

# no output at all
WGET_VERSION_OUT=''
check 1 'no version output'

# no wget at all
ln -s "$(command -v grep)" "$NO_WGET_BIN/grep"
export PATH="$NO_WGET_BIN"
check 1 'no wget on the PATH'
export PATH="$TEST_BIN:$OLDPATH"

cleanup